bug: ion-checkbox checked attribute

[mserranog]

Type: bug

Ionic Version: 2.x

Platform: all

ion-checkbox checked attribute values "false" and "true" shows ion-checkbox checked on 2.0.0-alpha.48. checked="true" and checked="" works fine, but I don't know if it's a code or documentation bug.

[brandyscarney]

Not seeing this with alpha.53: https://github.com/driftyco/ionic/blob/2.0/CHANGELOG.md#200-alpha53-2016-01-28

Please let me know if this is still an issue, thanks!